Abstract
Nonuniform size particles were fed to the middle part of a tower in which wire net screens were placed at a suitable distance and these particles were classified into two parts by air flowing upward in the tower. This apparatus is defined as a multi-screen particle classifier. The tower used in this experiment was 8.0 cm I.D., the sizes of wire net screen were 6, 10, 16 and 24 mesh respectively and the distances between the screens were 5 cm, 10 cm and 15 cm respectively. Glass beads from 48-mesh to 400-mesh size were classified with this classifier under different operating conditions. The characteristics of particle classification of this apparatus were quite excellent and are expressed by partial separation efficiency. The partial separation efficiency is roughly estimated from the apparent terminal velocity of particles and superficial gas velocity in the apparatus.
